The global routing table has passed the milestone of 512,000 routes. The table reached 256k routes in 2008.
The milestone is significant because exceeding 512,000 entries could cause Ternary Content Addressable Memory (TCAM) resource exhaustion for some networking products. In a blog posting, Cisco warned network administrators to check that networking equipment is updated for handling routing tables exceeding 512,000 routes. For its portfolio, equipment that needs to be checked includes:
- Cisco Catalyst 6500 Switches
- Cisco 7600 Series Routers
- Cisco ASR 9000 Series Aggregation Services Routers configured with Trident-based line cards (typhoon-based line cards are not affected)
- Cisco ASR 1000 Series Aggregation Services Routers with 4GB (devices with 8GB or RAM or higher can scale to up to 1,000,000 routes).
http://blogs.cisco.com/sp/global-internet-routing-table-reaches-512k-milestone/